Sight for guns.



Patenfadmne s, |902. J. BECKER. SIGHT FUR GUNS.

(Application led Feb. 8, 1902.)

2 Sheets-Sheet (no Modem,

YH: cams PETERS 0. pHoro-uma. wsHmnoN, D. c.

NoT 701,787. Patented lune 3, |902.

J. BECKER.

SIGHT Fu Guus.

(Application led Feb. 3, 19Q2.)

(No Model.) 2 Sheets-Sheet 2.

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UNITED STATES l PATENT GEEICE..A

JULIUS BECKER, OF ESSEN, GERMANY, ASSIGNOR TO FRIED. KRUPP, OFl` ESSEN,GERMANY.

SIGHT FOR GUNS.

SPECIFICATION forming part of Letters Patent No. 701,787, dated June 3,1902.

Application tiled February 3, 1902. Serial No. 92.375. (No model.)`

To all whom, it may concern.'

Beit known that I, JULIUs BECKER, residing at 17 Heinicke Strasse,Essen-on-the-Ruhr, Germany, have invented certain new and usefulImprovements in Sights for Guns, of which not admit of this the frontsight was rigidly.

attached to one of the trunnions of the gun or the cradle. This latterarrangement has the disadvantage that in elevating the gun the positionof the front sight changes. This requires that the scale beunsymmetrically graduated, as will be understood from the 'followingdiscussion, in which, for sake of simplicity, it will be assumed thatthe target is on the same level as the gun-that is to say, that thesighting-line directed upon the target is horizontal.

This discussion will be directed to Figure l. In said figure, drepresentsthe position which the front sight assumes when the gun is ina horizontal direction, and b and c are positions which the front sightassumes when the elevation of theV gun is fifteen degrees and thirtydegrees, respectively. The positions of the axis of the bore incident tothe above are d e, df, and d g and the incident sighting-lines a Z, h m,and c n, While h Zt represents the arc on which the notch of the rearsight travels. If it is desired to give the gun an elevation of ifteendegrees, thescale is shifted upward through an angle corresponding tothis elevation. now disregarded. Then the breech of the gun is depresseduntil the sighting-line again coincides with the target-r". c. againlies horizontal-that is to say, takes the position h m. If now the scalehas been shifted through an arc Zp=ef=15 and the gun has been depressedifteen degrees, the notch of the rear sight will have returned to thepoint Z, not to m. In other Words, it is not in the position The size ofthis angle is which it must assume in a horizontal line of sight andwith a fifteen-degree elevation of the gun. Hence it follows that togive the gun an elevation of fifteen degrees `thevscale must be shifted,not through an arc 119:15", but through an arc represented by Zp-Zm,While to give an elevation of thirty degrees to the gun it must beshifted, not through an arc lq, which is equal to thirty degrees, butZq-Z'n. Now while the arc Ig is twice the arc lp and the arc Zn greaterthan Qlm, hence it follows that the graduation of the scale mustbeunsymmetrical if the front sight is rigidly connected with one ofthetrunnions or the cradie; but such'a graduation must be separate'lyreckoned from one degree to another and for all of the subdivisions andis also very difficult to be protracted.

The present invention aims to provide an Aarrangement of front sight forwhich the bodimeni; of 'such an arrangement, and hence thepresentinvention attains the desired ends by mounting the holder of thefront sight independently of the scale either on the gun or upon thecradle in such a manner that it will be rotatable, but not displaceable,about the axis of the trunnions and prevented by a projecti'on on a xedpart of the carriage from partaking of the rotation of the trunnions. Inconsequence of this arrangement the front sight retains its positionduring the elevation of the gun, but is free to follow any shifting ofthe trunnions in their bearings.

The invention is shown in the drawings by' way of illustration invcombination with a piece of ordnance the gun of which is mount= ed in acradle, and in said drawings Fig. 2 shows in side elevation the parts ofthe gun The gun A is carried by its cradle'B, which is mounted throughtrunnions C Vin vthe carriage-walls D in a well-known manner. Atf

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tably mounted. Said ring is formed of two halves connected by screws Sand corresponds in Width to the groove E, so that it is not slidable inrelation to the axis of the trunnion, but can only turn thereon.Vertically above the trunnionaxis the ring F carries an enlargement G,the upper reduced portion of v which is provided with a vertical bore inVIO which the front sight H is secured by a setscrew K. Beneath thisbore the enlargement is provided with a slot L. Into this slot projectsan arm M, attached to the cover N of the trunnion-bearing, upon theturned end R of which a slide-block P is rotatably arranged. Thisslide-block bears against the side Walls of the slot, but has play insaid slot in directions both vertical and parallel to the axis of thetrunnion.

It is obvious from the above without further explanation that the frontsight will maintain its vertical position notwithstanding any adjustmentot' the elevation of the gun, yet is free to follow any lateral slidingof the trunnion and similar movements-as, for example, would be causedby wear of the trunnions and bearings. Moreover, the improvedarrangement of the front sight secures an advantage over a frontsightrigidly secured to the trunnion in that the sightingline directed ontargets which are at the same level as the point of the front sight arethe same length for all positions of the scale, and the length ischanged very little when the sighting-line is directed on targets whichlie higher or lower than the horizontal plane of the point of the frontsight.

Having thus described the invention, the following is what is claimed asnew therein:

1. In combination with a gun having a tangent scale curved concentric tothe trunnions, a front-sight carrier mounted independently of thetangent scale and rotatable about the axis of the trunnion, and anextension secured to a fixed part of the gun-mount in engagernent withsaid front-sight carrier and holding it against rotation with thetrunnion, so that the front sight maintains the same position fordifferent elevations of the gun but is free to follow any lateralshifting of the trunnions in their bearings.

2. In combination with a gun having a tangent scale curved concentric tothe trunnions, a front-sight carrier consisting of a ring, mounted in-agroove in the trunnion independently of the tangent scale and rotatableabout the axis of the trunnion; and an extension secured to a fixed partof the gun-mount in engagement with said front-sight carrier and holdingit against rotation with the trunnion, so that the front sight maintainsthe same position for different elevations of the gun but is free tofollow any shifting of the trunnions in their bearings.

3. In combination with a gun having a tangent scale curved concentric tothe trunnions, a front sight carrier consisting of a ring, mounted in agroove in the trunnion independently of the tangent scale and rotatableabout the axis of the trunnion, and an extension secured to a xed partof the gun-mount in engagement with said front-sight carrier and holdingit against rotation with the trunnion, through the medium of aslide-block, on the end of said arm, and a slot in said carrier intowhich said block enters, and has play, both vertically and parallel tothe trunnions axis, so that the front sight 'maintains the same positionfor different elevations of the gun but is free to follow any shiftingof the trunnions in their bearing.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JULIUS BECKER.

Witnesses:

WILLIAM EssENwEIN, LAURA LIEBER.

